Introduction To Health Physics
5th Edition
ISBN: 9780071835275
Author: Johnson, Thomas E. (thomas Edward), Cember, Herman.
Publisher: Mcgraw-hill Education,
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Chapter 6, Problem 6.4P
To determine
The temperature rises due to a total body dose of 5 Gy.
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The recommended adult dose of Elixophillin, a drug used to treat asthma, is 6mg/kg of body mass. Calculate the dose in milligrams for a 150lb person.
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A temperature rise of 3.10 ± 0.20 °C was measured when a reaction was carried out in a calorimeter with a heat capacity of 0.841 ± 0.014 kJ °C -1 .The enthalpy change (Δ H ) was worked out as -2.61 kJ by using the equation:Enthalpy change (Δ H ) = heat capacity ( c ) × temperature change ( T )What is the root-squared error (in kJ) for Δ H ?Quote your answer to two decimal places.When you submit your answer, do NOT include units.(The minus sign in front of the enthalpy change indicates that the reaction is exothermic; don't include it in your calculation.)
Chapter 6 Solutions
Introduction To Health Physics
Ch. 6 - A 50-µC/kg (approximately 200 mR) pocket dosimeter...Ch. 6 - Prob. 6.2PCh. 6 - Prob. 6.3PCh. 6 - Prob. 6.4PCh. 6 - Prob. 6.5PCh. 6 - Prob. 6.6PCh. 6 - Prob. 6.7PCh. 6 - Prob. 6.8PCh. 6 - Prob. 6.9PCh. 6 - Prob. 6.10P
Ch. 6 - Prob. 6.11PCh. 6 - Prob. 6.12PCh. 6 - Prob. 6.13PCh. 6 - Prob. 6.14PCh. 6 - Prob. 6.15PCh. 6 - Prob. 6.16PCh. 6 - Prob. 6.17PCh. 6 - Prob. 6.19PCh. 6 - Prob. 6.20PCh. 6 - Calculate the average power density, in watts per...Ch. 6 - Prob. 6.22PCh. 6 - Prob. 6.23PCh. 6 - Prob. 6.24PCh. 6 - Prob. 6.26PCh. 6 - Prob. 6.27PCh. 6 - Prob. 6.28PCh. 6 - Prob. 6.29PCh. 6 - Prob. 6.33P
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- The RDA for the trace element selenium is 0.000070 g>day. Express this dose in mg>day.arrow_forwardthe V•O2max of people tends to declineafter age 30 by about 9% per decade for sedentary individuals,but it declines less than 5% per decade for people who stay active.The average V•O2max in healthy 30-year-olds is about 3.1 L/min.Using the information given here, what would the average V•O2maxbe in 60-year-olds who have been sedentary throughout theirlives and in 60-year-olds who have stayed active (keep in mindthat the decline is exponential)?arrow_forwardShow that (ƏT· V др Cp (%) -1 Harrow_forward
- Using the systematics of exponential processes, the time scale for getting out of a pandemic at its peak through exponential decay of the infection rate or the death rate is estimated from: If the delta variant death rate per day (Po) peaked at 2000 in late September and declined at the national rate of − 1% per day, what is t, the time in days to defeat the virus (i.e. time until the last person dies)? answer choices: 350 525 450 760arrow_forwardCalculate the volume needed to dispense a 21 mCi dose from a Tc-99m DTPA vial containing 400 mCi in 6 ml. Answer:arrow_forwardFrom the average of these values, determine the maximum number of hours you could work with this material in a year if the annual maximum permissible dose is 2.4 mSv and you count with 200 working days in a yeararrow_forward
- What is the dose in mSv for 1.5 mGy of α exposure?arrow_forwardA radiographic technique calls for 46 kVp and 28 mAs which results in an exposure of 278 µGy. What is the expected exposure if the technique is changed to 75 kVp and 14 mAs? Round your answer to the nearest whole number. Do not include units.arrow_forward“Diffusion” sounds slow—and over everyday dis-tances it is—but on the scale of a cell it is very fast. The aver-age instantaneous velocity of a particle in solution—that is,the velocity between the very frequent collisions—isv = (kT/m)½where k = 1.38 × 10–16 g cm2/K sec2, T = temperature in K(37°C is 310 K), and m = mass in g/molecule.Calculate the instantaneous velocity of a watermolecule (molecular mass = 18 daltons), a glucose mol-ecule (molecular mass = 180 daltons), and a myoglobinmolecule (molecular mass = 15,000 daltons) at 37°C. Justfor fun, convert these numbers into kilometers/hour. Before you do any calculations, try to guess whether themolecules are moving at a slow crawl (<1 km/hr), an easywalk (5 km/hr), or a record-setting sprint (40 km/hr).arrow_forward
- Density is the ratio of mass to volume. If a uranium nucleus has a radius of 7.4 femtometers and nuclear mass of 238 AMU, what is its density in kg/m3? Assume the nucleus is sphere-shaped to find its volume.arrow_forwardc) A patient has a CT scan of their abdomen with an absorbed dose of 25.0 mSv. The scan ends near the top of their pelvis. Assume that 15% of their bone is scanned, 20% of their skin, 90% of their colon, 25% of their bladder and 10% of their lungs but none of their liver, stomach, and gonads. A further 20% of tissue characterised as 'remainder of the body' is also exposed during the scan. The tissue weighting factors for various organs is listed in the table below: Tissue weighting Tissue Tissue weighting factor factor skin 0.01 oesophagus 0.04 bone marrow 0.12 bladder 0.04 bone surface 0.01 breast 0.12 brain 0.01 gonads 0.08 0.12 thyroid 0.04 0.04 salivary glands 0.01 remainder of body 0.12 stomach 0.12 colon 0.12 Tissue lung liver What is the overall effective dose received by the patient from the CT scan?arrow_forward✓ ON "O 2.75 MeV 0.511 MeV 0.511 MeV B, E= 1.73 MeV Eave = 0.721 Mev O MeVarrow_forward
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